c++ - 预期的声明说明符或 '...' 之前的 'MLD_PACKET'

Question

无论我在哪里包含某个commands.h 头文件，在commands.c 之外的任何地方，编译器都会抛出此错误。 commands.h 包含使用 instrument.h 中定义的结构的函数原型(prototype)，特别是:

void readConfig(PSTATPLUS_CONFIG* pStatConfig_p, MLD_PACKET* rxPacketUart2_p);
void readState(PSTATPLUS_STATE* pStatState_p, MLD_PACKET* rxPacketUart2_p);
void writeConfig(PSTATPLUS_CONFIG* pStatConfig_p, MLD_PACKET* rxPacketUart2_p);
void writeState(PSTATPLUS_STATE* pStatState_p, MLD_PACKET* rxPacketUart2_p);

PSTATPLUS_CONFIG 和 PSTATPLUS_STATE 在 instrument.h 中这样定义:

typedef struct {
    float signalAmplitude;      // Signal Amplitude
    float signalOffset;         // Signal Offset
    unsigned char waveType;     // Waveform Type
    float startFreq;            // Frequency Start
    float stopFreq;             // Frequency Stop
    unsigned int numIncrements; // Number of Increments
    unsigned char scale;        // Linear(0) or log(1)
    float stepDelay;            // Step Delay
}PSTATPLUS_CONFIG;

typedef struct {    // Current biosensor status
    unsigned char scan;     // Scan status (on/off)
    unsigned char sample;   // Sample status (on/off)
    unsigned int currentIncrement; // Current scan increment
    unsigned char gain;     // Current gain setting
    float iValue;           // I voltage
    float qValue;           // Q voltage
    unsigned int sampleDivider; // 1 takes every ADC sample, 2 takes every 2nd ADC sample, 3 takes every 3rd ADC samp... n takes every nth. 0 stops data collection.
    unsigned int totalSamples;  // total number of samples wanted to complete one measurement.
}PSTATPLUS_STATE;

我需要在 commands.h header 中编写一些定义，以便我的 instrument.c 文件可以访问，但如前所述，每次我包含 命令时。 h 在那里，编译器会产生该错误。我已经尝试在我的其他一些源文件中包含 commands.h，同样的事情不断发生。感谢您的帮助。

丹

Answer 1

制作你的 commands.h #include "instrument.h" 因为它需要里面的东西否则 PSTATPLUS_CONFIG 或 PSTATPLUS_STATE 会导致错误。

#ifndef COMMANDS_INCLUDED
#define COMMANDS_INCLUDED

#include "instrument.h"

//.. as you were

#endif